IP telephony provides a way for you to extend highly secure, reliable, and consistent communications services to all your employees whether they are in main campus locations, at branch offices, working remotely, or are mobile.
IP telephony transmits voice communications over the network using open-standards-based Internet Protocol i.e. calls can be made over the internet. It provides voice communication over the Internet rather than via the public switched telephone network(PSTN).
We can Make Voice call over Ip by using our api. our api gives facility to send multiple voice over internet or ip.